DataGridView control has an extra scrollbar when adding a new column in DemoConsole application

[Philip-Wang01]

.NET version

main branch of WinForms repo

Did it work in .NET Framework?

Not tested/verified

Did it work in any of the earlier releases of .NET Core or .NET 5+?

This is not a regression issue. Also reproduced on the release/9.0 branch.

Issue description

DataGridView control has an extra scrollbar when adding a new column in DemoConsole application.

testdatagridviewscrollbar.mp4

Steps to reproduce

1: Open the test sample: DemoConsole in Winforms repo.
2: Switch to the TabControl and TableLayoutPanel tabpage and select the DataGridView control in the lower right corner.
3: First add a column via “Add Column...”. Then add a column via "Edit Columns...".

More Info:
The scrollbar disappears when you resize the DataGridView control.

[Tanya-Solyanik]

@Philip-Wang01 - do you see the same in the OOP designer when creating a NET10 app that runs on the latest build from winforms main?

[Philip-Wang01]

@Tanya-Solyanik The situation you describe is not reproduced. This issue is only reproduced in the DemoConsole application.

[merriemcgaw]

@Philip-Wang01 can you please verify whether this happens in .NET 8? Can we also confirm whether that 'extra scrollbar' is a visual artifact or it works. @Olina-Zhang, let's create another issue to make this DemoConsole application multi-targeted to Framework so that we can validate where we've got regressions from NetFX. @ricardobossan - feel free to pick up this issue.

[Philip-Wang01]

@merriemcgaw The DemoConsole application for .NET 8.0 does not have DataGridView control. It has been verified that this is an HDPI issue that cannot be reproduced at 100% screen resolution. Since this is a design page, the scrollbars don't work properly.

[Olina-Zhang]

@merriemcgaw @ricardobossan another issue for DemoConsole app multi-targeted: #12830